How many captcha attempts before you quit?

I travel to a lot of different websites and experience a lot of captcha codes. I was wondering what was the most attempts you have gone through and had to give up and move on? Some sites have easy to read captcha’s but some are very difficult to read, unfortunately this is a unnecessary evil that most website owners have to put on their site to keep spam from getting out of control. Please leave a comment I am curious what the most is.

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